Tightening tool

A tightening tool wherein when a tightening torque has reached a set torque value and a torque limiter is actuated, an electronic circuit unit that has obtained a detection signal outputted from a torque limiter actuation detection unit outputs a tightening completion signal, the tightening tool comprising

• a power generation unit that feeds electric power to the electronic circuit unit at least during the actuation of the torque limiter,
• wherein the power generation unit is of an electromagnetic induction type in which switching magnetic poles of the N pole and the S pole to be applied to a pair of poles of a yoke by pole switching means generates an electromotive force from an induction coil wound on the yoke, and the switching of the pole switching means is driven with the use of a mechanical operation during the actuation of the torque limiter.

A tightening tool wherein when a tightening torque has reached a set torque value and a torque limiter is actuated, an electronic circuit unit that has obtained a detection signal outputted from a torque limiter actuation detection unit outputs a tightening completion signal, the tightening tool comprising

• a power generation unit that feeds electric power to the electronic circuit unit at least during the actuation of the torque limiter,
• wherein the power generation unit is a mechanical-electrical energy conversion element that converts mechanical energy into electrical energy, and an impact is applied to the mechanical-electrical energy conversion element with the use of a mechanical operation during the actuation of the torque limiter.

A tightening tool wherein when a tightening torque has reached a set torque value and a torque limiter is actuated, an electronic circuit unit that has obtained a detection signal outputted from a torque limiter actuation detection unit outputs a tightening completion signal, the tightening tool comprising

• a power generation unit that feeds electric power to the electronic circuit unit at least during the actuation of the torque limiter,
• wherein the power generation unit is a thermoelectric conversion element that converts a temperature difference into electrical energy, provided in a grip portion on which an operator takes a grip in a tightening operation.